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Radio frequency current probe characteristic calibrating method based on electromagnetic compatibility analysis and application

A technology of radio frequency current and current probes, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve problems such as changes in transfer impedance, achieve accurate results, simple operation, and accurate testing

Inactive Publication Date: 2010-07-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0006] Aiming at the problem that the transfer impedance of the current probe will change in different measurement environments or in different frequency ranges, the present invention proposes a method for calibrating the transfer impedance of the radio frequency current probe based on electromagnetic compatibility analysis and application

Method used

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  • Radio frequency current probe characteristic calibrating method based on electromagnetic compatibility analysis and application
  • Radio frequency current probe characteristic calibrating method based on electromagnetic compatibility analysis and application
  • Radio frequency current probe characteristic calibrating method based on electromagnetic compatibility analysis and application

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Embodiment Construction

[0029] The circuit principle of the current probe used to measure the electromagnetic interference noise current in the circuit is as follows: image 3 shown. The current probe uses mutual inductance to induce the actual electromagnetic interference noise in the line into the probe and transmit it to the measuring instrument. The equivalent circuit model of current probe testing electromagnetic interference noise is as follows: Figure 4 shown. according to Figure 4 , the transfer impedance Z(ω) is defined as:

[0030] Z ( ω ) = V 2 ( ω ) I 1 ( ω ) - - - ( 1 )

[0031] Due to the mutual inductance o...

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Abstract

The invention discloses a radio frequency current probe characteristic calibrating method based on electromagnetic compatibility analysis and application and belongs to the field of electromagnetic compatibility analysis and application and electromagnetic interference noise measurement. According to a frequency section needing to be measured, in the method, the transfer impedance of a current probe is tested in a time domain by utilizing a dual-trace oscilloscope and then tested in a frequency domain by utilizing a vector network analyzer and adopting a scattering parameter method; and finally, a measurement conversion coefficient of the current probe can be more accurately obtained. The method has simple operation and accurate test, enables a result of electromagnetic interference noisemeasured by the current probe to be more accurate, and provides a theoretical basis for conducting the electromagnetic interference noise.

Description

technical field [0001] The invention relates to a characteristic calibration method of a radio frequency current probe based on electromagnetic compatibility analysis and application, and belongs to the fields of electromagnetic compatibility analysis and application and electromagnetic interference noise measurement. Background technique [0002] The problem of EMI electromagnetic interference noise is becoming more and more serious with the extensive use of various electronic equipment. In order to suppress the electromagnetic interference noise, it is first necessary to measure the electromagnetic interference noise, and the RF current probe is a tool for measuring the electromagnetic interference noise in the circuit. A current probe basically consists of a magnetic core, which detects the magnitude of the magnetic flux present and transmits the measurement of this field to the receiving end. Current probes can be used as an alternative to voltage probes, and current pr...

Claims

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Application Information

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IPC IPC(8): G01R35/00G01R27/00
Inventor 赵波赵敏封志明姚敏董颖华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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